Workpiece unit
AssigneeDisco Corporation
InventorsYoshinobu Saito, Masayuki Matsubara
Life of this patent
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Abstract
A workpiece unit that includes a workpiece, a tape stuck to the workpiece; and an annular frame to which an outer circumferential edge of the tape is stuck and which has an opening defined centrally therein. The workpiece is disposed in the opening in the annular frame and supported on the annular frame by the tape, and at least one of the tape and the annular frame has an irreversible discoloring section that discolors in response to an external stimulus. Such a configuration makes it possible to determine whether or not a process involving an external stimulus has been carried out on the workpiece unit, based on the appearance of the workpiece unit (i.e., based on whether the irreversible discoloring section has been discolored or not).
Claims14
A workpiece unit comprising:
- a workpiece;
- a tape stuck to the workpiece;
- and
- an annular frame to which an outer circumferential edge of the tape is stuck and which has an opening defined centrally therein,
- the workpiece being disposed in the opening in the annular frame and supported on the annular frame by the tape,
- wherein at least one of the tape and the annular frame has an irreversible discoloring section that discolors in response to an external stimulus, and
- wherein the irreversible discoloring section comprises an ultraviolet ink that irreversibly discolors when irradiated with ultraviolet radiation.
A workpiece unit comprising:
- a workpiece;
- a tape stuck to the workpiece;
- an annular frame to which an outer circumferential edge of the tape is stuck and which has an opening defined centrally therein;
- and
- an annular area defined between an outer circumferential edge of the workpiece and an inner circumferential edge of the annular frame, wherein the tape is exposed at the annular area;
- wherein the workpiece is disposed in the opening in the annular frame and supported on the annular frame by the tape,
- wherein the tape has an irreversible discoloring section that discolors in response to an external stimulus, and
- wherein the irreversible discoloring section is visible in the annular area between the outer circumferential edge of the workpiece and the inner circumferential edge of the annular frame to alert a user whether or not a process has been performed upon the workpiece unit.
A workpiece unit comprising:
- a workpiece;
- a tape stuck to the workpiece;
- an annular frame to which an outer circumferential edge of the tape is stuck and which has an opening defined centrally therein, wherein the workpiece is disposed in the opening in the annular frame and is supported on the annular frame by the tape;
- and
- an ultraviolet radiation detecting seal affixed to a portion of the annular frame between the outer circumferential edge of the tape and an outer circumferential edge of the annular frame,
- wherein the ultraviolet radiation detecting seal discolors in response to being irradiated with ultraviolet radiation.
Dependencies are inferred from the claim text.